An electron diffraction and crystal chemical investigation of oxygen/fluorine ordering in niobium oxyfluoride, NbO2F

被引：37

作者：

Brink, FJ ^{[1
]}

Withers, RL

Norén, L

机构：

[1] Australian Natl Univ, Res Sch Chem, Canberra, ACT 0200, Australia

[2] Australian Natl Univ, Electron Microscope Unit, Res Sch Biol Sci, Canberra, ACT 0200, Australia

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2002年 / 166卷 / 01期

关键词：

D O I：

10.1006/jssc.2002.9562

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A careful electron diffraction study of the ReO3-type oxyfluoride NbO2F has revealed the presence of characteristic transverse polarized planes of diffuse intensity running through the G +/- <hk1/3>* regions of reciprocal space as well as continuous rods of diffuse intensity running through the G +/-<1/2 1/2xi>* regions of reciprocal space. The continuous planes of diffuse intensity in reciprocal space (perpendicular to each of the major crystal directions a, b and c) imply the existence of one-dimensional, oxygen/fluorine-ordered columns of atoms along <001> in real space but with no lateral correlation in the ordering from such <001> column to the next. The continuous lines of diffuse intensity along the <1/2 1/2xi>* directions of reciprocal space are ascribed to Rigid Unit Mode (RUM) rotations of the constituent MX6 octahedral framework. A combination of bond-valence arguments and simple structure factor calculations are used to support this argument. (C) 2002 Elsevier Science (USA).

引用

页码：73 / 80

页数：8

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